First slide

Second law

Question

A hockey player is moving northward and suddenly turns westward with the same speed to avoid an opponent. The force that acts on the player is

Moderate

A

frictional force along westward
B

muscle force along southward
C

frictional force along south-west
D

muscle force along south-west

Solution

Change in momentum $= mv (- \hat{i}) - mv (+ \hat{j}) = mv (- \hat{i} - \hat{j})$ .
The external friction force acts in the direction of change in momentum i.e., along south-west direction.

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